A:since
B:whe
C:although
D:if
父亲有耳垂(A)为显性,母亲无耳垂(a)为隐性,生下的女儿无耳垂,则父亲的基因组成是( )
—How was your recent trip to Sichuan? —I've never had_______ one before.
下列划线的字词注音完全正确的一项是( )